Bdale Garbee and Keith Packard TELEGPS, Руководство пользователя

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TeleGPS System Operation
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If the GPS receiver loses lock, the APRS data transmitted will contain the last position for which GPS lock
was available. You can tell that this has happened by noticing that the GPS status character switches
from
L
to
U
. Before GPS has locked, APRS will transmit zero for latitude, longitude and altitude.
A.3. Configurable Parameters
Configuring TeleGPS is very simple; the few configurable parameters can all be set using the TeleGPS
application over USB. Check out Section 3.13, “Configure Device”.